92 Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide
Self Test
Troubleshooting Self Test 901 to 905
Troubleshooting Self Test 901 to 905
These self tests validate the LO signal from the output of the synthesizer
section of the A3 RF assembly. There is circuitry on the A3 RF assembly that
cannot be isolated specifically to the A3 RF assembly by self tests, including
the associated vertical SMA connector (J2004) that is on the A3 RF assembly.
If this connector opens up or if there is a short, then a self test failure 901 can
occur. A similar issue can occur and cause self test failures 903 and 904 if
connector J2003 opens up or shorts. These same self test failures can also be
caused by the corresponding vertical SMA connectors on the A2 Vector
assembly should connectors P1 or P2 open or short. The connecting semi-rigid
cables W7 or W8 should also be eliminated as possible causes for these self
test failures.
If these self test(s) fail, perform the following:
1. Carefully remove W7 and W8 from both of their connectors.
2. Inspect and verify the cables are acceptable.
a.If a cable is considered faulty, replace the cable.
3. Verify connectors J2004 and J2003 are properly attached to the PCB by
gently attempting to move both connectors.
a.If either connector is loose, replace the A3 RF assembly.
4. Similarly verify that both connectors P1 and P2 on the A2 Vector assembly
are properly attached.
a.If either connector is loose, replace the A2 Vector assembly
5. If the connectors are properly attached, go to step 6.
6. Connect the output from connector J2004 to a spectrum analyzer.
7. Setup the spectrum analyzer:
a.Set the reference level to +10 dBm.
b.Set the center frequency to 1GHz.
c.Set the Span to 100 MHz.
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